Serial Port Complete - Latest Microcontroller projects

Chapter 16

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bLength 0x08 Descriptor size in bytes (8)

bDescriptorType 0x0B Descriptor type (IAD)

bFirstInterface 0x00 First associated interface

bInterfaceCount 0x02 Number of associated interfaces

bFunctionClass 0x02 Class code (communication)

bFunctionSubClass 0x02 Subclass code (abstract control model)

bFunctionProtocol 0x02 Protocol code (V.25ter)

iFunction 0x01 String descriptor index

Table 16-9: Example device, configuration, and interface association descriptors for a
composite device that includes a CDC function (Sheet 2 of 2).